Using a calculator, find the value of the cosine of 15.5^◦ and the value of the cosine of 375.5^◦. Display as many digits as your calculator is able to display. Check to see if your calculator produces any round-off error in the last digit. Choose another pair of angles that differ by 360^◦ and repeat the calculation. Set your calculator to use angles measured in radians. Find the value of sin (0.3000). Find the value of sin (0.3000 + 2π). See if there is any round-off error in the last digit.